package org.apache.maven.plugin;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.List;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.model.Plugin;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.RemoteRepository;

// TODO: the antrun plugin has its own configurator, the only plugin that does. might need to think about how that works
// TODO: remove the coreArtifactFilterManager

@Component(role = BuildPluginManager.class)
public class DefaultBuildPluginManager implements BuildPluginManager {

  @Requirement
  private MavenPluginManager mavenPluginManager;

  @Requirement
  private LegacySupport legacySupport;

  /**
   * 
   * @param plugin
   * @param repositories
   * @param session
   * @return PluginDescriptor The component descriptor for the Maven plugin.
   * @throws PluginNotFoundException The plugin could not be found in any repositories.
   * @throws PluginResolutionException The plugin could be found but could not be resolved.
   * @throws InvalidPluginDescriptorException
   */
  public PluginDescriptor loadPlugin(Plugin plugin, List<RemoteRepository> repositories,
      RepositorySystemSession session) throws PluginNotFoundException, PluginResolutionException,
      PluginDescriptorParsingException, InvalidPluginDescriptorException {
    return mavenPluginManager.getPluginDescriptor(plugin, repositories, session);
  }

  // ----------------------------------------------------------------------
  // Mojo execution
  // ----------------------------------------------------------------------

  public void executeMojo(MavenSession session, MojoExecution mojoExecution)
      throws MojoFailureException, MojoExecutionException, PluginConfigurationException, PluginManagerException {
    MavenProject project = session.getCurrentProject();

    MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();

    Mojo mojo = null;

    ClassRealm pluginRealm;
    try {
      pluginRealm = getPluginRealm(session, mojoDescriptor.getPluginDescriptor());
    } catch (PluginResolutionException e) {
      throw new PluginExecutionException(mojoExecution, project, e);
    }

    ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
    Thread.currentThread().setContextClassLoader(pluginRealm);

    MavenSession oldSession = legacySupport.getSession();

    try {
      mojo = mavenPluginManager.getConfiguredMojo(Mojo.class, session, mojoExecution);

      legacySupport.setSession(session);

      // NOTE: DuplicateArtifactAttachmentException is currently unchecked, so be careful removing
      // this try/catch!
      // This is necessary to avoid creating compatibility problems for existing plugins that use
      // MavenProjectHelper.attachArtifact(..).
      try {
        mojo.execute();
      } catch (ClassCastException e) {
        // to be processed in the outer catch block
        throw e;
      } catch (RuntimeException e) {
        throw new PluginExecutionException(mojoExecution, project, e);
      }
    } catch (PluginContainerException e) {
      throw new PluginExecutionException(mojoExecution, project, e);
    } catch (NoClassDefFoundError e) {
      ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
      PrintStream ps = new PrintStream(os);
      ps.println("A required class was missing while executing " + mojoDescriptor.getId() + ": " + e.getMessage());
      pluginRealm.display(ps);

      Exception wrapper = new PluginContainerException(mojoDescriptor, pluginRealm, os.toString(), e);

      throw new PluginExecutionException(mojoExecution, project, wrapper);
    } catch (LinkageError e) {
      ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
      PrintStream ps = new PrintStream(os);
      ps.println("An API incompatibility was encountered while executing " + mojoDescriptor.getId() + ": "
          + e.getClass().getName() + ": " + e.getMessage());
      pluginRealm.display(ps);

      Exception wrapper = new PluginContainerException(mojoDescriptor, pluginRealm, os.toString(), e);

      throw new PluginExecutionException(mojoExecution, project, wrapper);
    } catch (ClassCastException e) {
      ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
      PrintStream ps = new PrintStream(os);
      ps.println("A type incompatibility occured while executing " + mojoDescriptor.getId() + ": " + e.getMessage());
      pluginRealm.display(ps);

      throw new PluginExecutionException(mojoExecution, project, os.toString(), e);
    } finally {
      mavenPluginManager.releaseMojo(mojo, mojoExecution);

      Thread.currentThread().setContextClassLoader(oldClassLoader);

      legacySupport.setSession(oldSession);
    }
  }

  /**
   * TODO pluginDescriptor classRealm and artifacts are set as a side effect of this call, which is
   * not nice.
   * 
   * @throws PluginResolutionException
   */
  public ClassRealm getPluginRealm(MavenSession session, PluginDescriptor pluginDescriptor)
      throws PluginResolutionException, PluginManagerException {
    ClassRealm pluginRealm = pluginDescriptor.getClassRealm();
    if (pluginRealm != null) {
      return pluginRealm;
    }

    mavenPluginManager.setupPluginRealm(pluginDescriptor, session, null, null, null);

    return pluginDescriptor.getClassRealm();
  }

  public MojoDescriptor getMojoDescriptor(Plugin plugin, String goal, List<RemoteRepository> repositories,
      RepositorySystemSession session) throws PluginNotFoundException, PluginResolutionException,
      PluginDescriptorParsingException, MojoNotFoundException, InvalidPluginDescriptorException {
    return mavenPluginManager.getMojoDescriptor(plugin, goal, repositories, session);
  }

}
